Unconventional superconductivity in ferromagnetic UGe2

A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study

H. Kotegawa, S. Kawasaki, A. Harada, Y. Kawasaki, K. Okamoto, G. Q. Zheng, Y. Kitaoka, E. Yamamoto, Y. Haga, Y. Onuki, Kohei M Itoh, E. E. Haller

Research output: Contribution to journalArticle

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Abstract

We report 73Ge nuclear magnetic resonance/nuclear quadrupole resonance (NMR/NQR) measurements on the itinerant ferromagnetic superconductor UGe2 at ambient pressure (P = 0) and P = 1.3 GPa. Measurements of the nuclear spin-lattice relaxation rate 1/T1 of the 73Ge NMR at P = 0 have revealed a T1T = constant behaviour well below TCurie = 52 K, evidencing the presence of a non-zero density of states at the Fermi level for the up-and down-spin bands in the ferromagnetic state. At P = 1.3 GPa, where the ferromagnetic transition is reduced to TCurie = 26 K, the dependence on temperature (T) of NQR 1/T1 at zero field has demonstrated the onset of the superconducting transition at Tc = 0.55 K. The lack of a coherence peak in (1/T1) just below Tc, followed by a T3-like behaviour, provide compelling evidence for the unconventional nature of the superconducting state that coexists with the ferromagnetic state on a microscopic scale in UGe2.

Original languageEnglish
JournalJournal of Physics Condensed Matter
Volume15
Issue number28
DOIs
Publication statusPublished - 2003 Jul 23

Fingerprint

Nuclear quadrupole resonance
nuclear quadrupole resonance
Superconductivity
superconductivity
Nuclear magnetic resonance
nuclear magnetic resonance
Spin-lattice relaxation
Fermi level
spin-lattice relaxation
nuclear spin
Superconducting materials
Temperature
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Unconventional superconductivity in ferromagnetic UGe2 : A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study. / Kotegawa, H.; Kawasaki, S.; Harada, A.; Kawasaki, Y.; Okamoto, K.; Zheng, G. Q.; Kitaoka, Y.; Yamamoto, E.; Haga, Y.; Onuki, Y.; Itoh, Kohei M; Haller, E. E.

In: Journal of Physics Condensed Matter, Vol. 15, No. 28, 23.07.2003.

Research output: Contribution to journalArticle

Kotegawa, H, Kawasaki, S, Harada, A, Kawasaki, Y, Okamoto, K, Zheng, GQ, Kitaoka, Y, Yamamoto, E, Haga, Y, Onuki, Y, Itoh, KM & Haller, EE 2003, 'Unconventional superconductivity in ferromagnetic UGe2: A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study', Journal of Physics Condensed Matter, vol. 15, no. 28. https://doi.org/10.1088/0953-8984/15/28/323
Kotegawa, H. ; Kawasaki, S. ; Harada, A. ; Kawasaki, Y. ; Okamoto, K. ; Zheng, G. Q. ; Kitaoka, Y. ; Yamamoto, E. ; Haga, Y. ; Onuki, Y. ; Itoh, Kohei M ; Haller, E. E. / Unconventional superconductivity in ferromagnetic UGe2 : A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study. In: Journal of Physics Condensed Matter. 2003 ; Vol. 15, No. 28.
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